I would recommend that you first locate the phone modem (generally installed by your electrical panel if possible - it will have lights such as TEL1, TEL2 and Link), then remove the power cable, unscrew the coaxial cable and remove the battery (from the underside, under a panel). Reinsert the battery and reconnect the cables after 60 seconds.

If you still have a busy signal, if possible take a phone and plug it into the TEL1 port on the back of the phone modem to see if that works.

I would recommend that you first locate the phone modem (generally installed by your electrical panel if possible - it will have lights such as TEL1, TEL2 and Link), then remove the power cable, unscrew the coaxial cable and remove the battery (from the underside, under a panel). Reinsert the battery and reconnect the cables after 60 seconds.

If you still have a busy signal, if possible take a phone and plug it into the TEL1 port on the back of the phone modem to see if that works.